Hi Chris, Nice to see you on the list.
While this is definitely off-topic, I trust I might be given license by the list's few remaining readers to point out that the match-case construct is for _structural_ pattern matching. As I wrote in the latest Nutshell: "Resist the temptation to use match unless there is a need to analyse the _structure_ of an object." I don't believe it's accidental that match-case sequence patterns won't match str, bytes or bytearrray objects - regexen are the tool already optimised for that purpose, so it's quite impressive that you are managing to approach the same level of performance! Kind regards, Steve On Wed, 2 Aug 2023 at 18:26, Christian Tismer-Sperling <tis...@stackless.com> wrote: > On 02.08.23 18:30, Paul Moore wrote: > > On Wed, 2 Aug 2023 at 15:24, Stephen J. Turnbull > > <turnbull.stephen...@u.tsukuba.ac.jp > > <mailto:turnbull.stephen...@u.tsukuba.ac.jp>> wrote: > > > > Partly because that's where the other discussants are (the network > > externality is undeniably powerful), and partly (I believe) because > > effective use of email is a skill that requires effort to acquire. > > Popular mail clients are designed to be popular, not to make that > > expertise easy to acquire and exercise. Clunky use of email makes > > lists much less pleasant for everyone than they could be. > > > > I guess that's sad (I am, after all, a GNU Mailman developer), but > > it's reality. > > > > > > Personally, I'm sad because some people whose contributions I enjoy (you > > being one of them :-)) didn't move to Discourse. But like you say, it's > > how things are. > > > > Christian - you can make named constants using class attributes (or an > > enum): > > > > class A: > > M = "M" > > > > match seq: > > case A.M, A.M, A.M, A.M, *r: > > return 4*1000, r > > > > Basically, the "names are treated as variables to assign to" rule > > doesn't apply to attributes. > > > > I'm not sure how helpful that is (it's not particularly *shorter*) but I > > think the idea was that most uses of named constants in a match > > statement would be enums or module attributes. And compromises had to be > > made. > > > > Cheers, > > Paul > > Thanks a lot, everybody! > > I have tried a lot now, using classes which becomes more readable > but - funnily - slower! Using the clumsy if-guards felt slow but isn't. > > Then I generated functions even, with everything as constants, > and now the SPM version in fact out-performs the regex slightly! > > But at last, I found an even faster and correct algorithm > by a different approach, which ends now this story :) > > Going to the Discourse tite, now. > > Cheers -- Chris > -- > Christian Tismer-Sperling :^) tis...@stackless.com > Software Consulting : http://www.stackless.com/ > Strandstraße 37 : https://github.com/PySide > 24217 Schönberg : GPG key -> 0xFB7BEE0E > phone +49 173 24 18 776 fax +49 (30) 700143-0023 > > _______________________________________________ > Python-Dev mailing list -- python-dev@python.org > To unsubscribe send an email to python-dev-le...@python.org > https://mail.python.org/mailman3/lists/python-dev.python.org/ > Message archived at > https://mail.python.org/archives/list/python-dev@python.org/message/OFLAU34KWAKREKG4H2M5GES3PGT6VBAU/ > Code of Conduct: http://python.org/psf/codeofconduct/ >
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